and then carol daly, the female detective, showed up.nd i call her my angel. >> one of my great heroes of this story is carol daly. she was an investigator for the sheriff department in sacramento. she was asked to go out and interview the victims. >> maybe something that the man said, or something that he did to you, or something that you recall hearing. >> through that process, she was able to glean a lot of information like what he would say to his victims. and sometimes he would call out a name. >> in one of the cases, the victim said that she heard him crying and saying, "bonnie." >> for years, detectives didn't know what to make of this name. who's bonnie? >> bonnie was a mystery woman, at the center of the case. >> bonnie was the girlfriend and then fiance of joseph deangelo. >> one of the first women to get a real glimpse of the psychopathy behind joe deangelo was bonnie colwell. >> she's 18, really smart, going to a community college, studying nursing. and she's in the middle of the quad this older guy ambles up to her and begin